Bump com.google.protobuf:protobuf-java from 4.28.2 to 4.28.3 (#205)

Bumps
[com.google.protobuf:protobuf-java](https://github.com/protocolbuffers/protobuf)
from 4.28.2 to 4.28.3.
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Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Philip K. Warren <[email protected]>

buf.gen.yaml

@@ -1,4 +1,4 @@
 version: v2
 plugins:
-  - remote: buf.build/protocolbuffers/java:v28.2
+  - remote: buf.build/protocolbuffers/java:v28.3
     out: src/main/java

conformance/buf.gen.yaml

@@ -5,5 +5,5 @@ managed:
     - file_option: java_package_prefix
       value: build
 plugins:
-  - remote: buf.build/protocolbuffers/java:v28.2
+  - remote: buf.build/protocolbuffers/java:v28.3
     out: src/main/java